Manufacture of printers&#39; leads, rules, &amp;c.



A. L. KNIGHT. MANUFACTURE OF PRiNTERS LEADS, RULES 6w.

APPLICATION HLEDfJULY 21,1916 1,256,806. Patented Feb. 19, 1918 To all whom. c'tmay cancer n UNITED STATES PATENT onricn.

WAMOSP.K1\TIGHT, 'QF PHILADELPHIA, PENNSYLVANIA, ASSIGNOB '10 LANsTon Mono- T-YPn'mAcHmE COMPANY, or PHILADELPHIA, PENNSYLVANIA, A CORPORATION on VIRGINIA;

' MANUFACTURE or rnni'rnns LE DS, RULES, 85's..

Specification Of LB ttCl'S Patent.

Patented Feb. 19, 1918.

Application filed July 2'7, 1916. Serial No. 111,741.

.. Be it known that A nos ll. Kmcnna wcltizen ofthe; l nited States, residing at and State of Pennsylvania.

Philadelphia. in the county of Philadelphia have invented certain new and useful In'iprovemcnts 1n the Manufacture of Printers Leads, Rules,

&c.; and I do hereby declare the following to be a .full, clear, and exact description of .l'ho reference being hadto the accom- :panying drawings, forming. part of this specification.

overcome this difficulty, ...45

accurately uniform .mentis. initially madeof 1: accordance with. the variation in the degree of; shrinkage, as the ,metal freezes and cools a The present. invention relates to improve- .ments in the manufacture of leads, rules,

-etc., which constitute elements of printing forn1s, and more particularly to the manufacture of such elements when formed or cast in successive increments, fused together at their proximate or meeting edges. Machines for casting printers rules, leads, etc, of type. metal in successive increments joined I together. at their proximate edges by fusion, 1

. such asset forth in a prior application filed by: inc on October 3, 1914, Serial No. 864,894,.

.now Patent No. 1,222,415, dated April 10,

1917,.havebecome well known in the art, and this lfype of machine, therefore, needs nofdetail description for an understanding of the present invention.

In the format-ion or casting ofthese strip elements of printing forms in successive in considerable difliculty has been experienced in the production of strips of in that dimension of the strip which correisiponds to the height-of the type. This di culty I have discovered is due to an unequal shrinkage in the metal, as iti'freezes and cools, with the result that the height of. .eachincr'ement will vary between the ed e which joins the preceding increment and the edge Whl 0h ]O1I1S the succeeding increment.

The object of the present invention is to and in accomplishing this end I have found that if each increvarying height, in

the final rsult-w-ill be a strip of uniform .height, the edgeof-Which will constitute a true and perfect printing surface.

In the accompanying drawings, gure .1 is aJmore or less diagrammatic representation of a short section of a printclearly.

height, that is to say,

is of uniform tion .whichi lower at.

uniform height tith up, .menti ers rule, showing the defect in thoupper edge due-to non-uniformcontraction of the metal in freezing and cooling.

Fig. 2 is a, similar View of a short section of a printers rule of uniform height throughout.

Fig. 3 is a riew corresponding to and showing in dotted lines the 'lIlllll; of one of the increments.

Fig. 4 is a diagrammatic section-ai. elevation, showing a mold indotted linesflv-it a mold bladeand a matrix for giving the proper initial formation to the increment of type metal as they are cast.

In all of the views it will be undc1-'--stood that the variation in height is exaggeia in order to illustrate the invention more In said drawings, Fig. 1 shows asset-ion of a printers rule or lead, which has been cast in successive incremcntso, 5, etc, the dotted lines indicating the rox imate edges of successive increments. ach succeeding increment has been, added to theleft. hand edge of preceding increments, underwhich conditions itwillbe noted that the forward edge of each increment or that edge toward the right is of greaterheight than the rear or left hand edge, this being due to the fact jthat at the edge where the succeeding incren ents fuse with the edge of the preceding increments, the shrinkage of the metal is less than at the opposite edge.

InFi 2 a strip or rule ofprop er formation is ilnstrated, wherein it will :noted that each increment 6, 6, 6,,ietc,,'is ofuniform height, and as a result, the entirestrip height, or in other word he top edge of each increment alines with. top edges of preceding increments.

4 n Fig. 3, the strip shown jin Fig. 2 is illustrated and in addition there .is shown in dotted lines at 7 an incrementlwhich is given its proper initial formation git-hat is to say, its upper edge 8', is ,inc linedupi ardly from the point where it meets the pr'cfilding increment, thus producingan initial: rema- 4 "itsforivard cdgefthan at its rear .edge, im dcr which circumstances, the shrinkage {of the (it; is" suchtha'twhen frozen and cool'd, ncr enient, is 'of'a I Fig; '4 tluirei s 1ndich' tedHottedlines gage an alas.

A mold blade 12 is adapted to reciprocate in the cavity and to normally form its rear wall, while, the preceding increment of frozen metal forms the front Wall of said cavity. Said metal is retained in position by the forwardly projecting portions of the mold, until it is advanced by the reciprocation of the mold blade to form a space for cavity for the reception of the next increment. The matrix 11 is formed with a matrix cavity or recess which gradually varies in depth or drive asindicated by the infilined top wall 13,, the inclination being shown as slightly exaggerated in the drawings, and the greatest depth being at the rear or left hand edge of the cavity/' Its least depth is approximately at the point where the preceding increment of the rule remains to form the forward edge 'wall of the cavity. The

matrix drive or recess preferably extends beyond the last mentioned point and 1s preferably provided with a slightly flared or inclined discharge or exit extension to give clearance to the frozen metal as it is pushed out. of the cavity.

In the formation of matrices of this kind, difficulty has been experienced in making the depth of the drive or matrix cavity accu; rately so as to correspond to the shrinkage of the metal in freezing and cooling and in the preferred method of manufacture the matrix cavity is first made of uniform depth throughout and the matrix is subsequently bent slightly at a point which substantially corresponds to the forward or right hand 'edge of the mold cavity. To facilitate this bending, a transverse cut or kerf 14 is formed .in the matrix. After the bending of the matrix in the manner indicated the top and bottom faces are dressed be parallel with each other and to anextent which will provide for the proper depth of the matrix cavity. I

.T-his procedure .in the manufacture of matrices greatly simplifies their production and permits of the formation of matrix cavities of complex or ornamental designs which will vary in depth to, exactly the proper degree to produce borders forornamental rules having true printing surfaces which will exactly correspond to the height of the printing. surfaces of the other portions of the printing form; in other words, they will be uniformly type-high throughout.

printers leads, rules. etc., in successive inmoeeoc crements fused together at their proximate edges, which consists in initially forming each increment of greater height at one of edge, than at its forward edge, where .it joins the preceding increment, whereby the contraction of the metal in freezing and cooling will produce a strip of uniform height.

3. The improvement in the art of casting printers leads, rules, etc, in successive increments fused together at their proximate edges, which consists in initially forming each increment of greater height at one of said edges than at the other. and in fusing the edge of less height to the'edge of the preceding increment, whereby the contraction of the metal in freezing and cooling will produce a strip of uniform height.

4. In an apparatus for casting printers leads, rules, etc, in successive increments fused together at their proximate edges, the combination of the following instrumentalities, to wit, a mold having a cavity open at one side, a mold blade mounted to reciprocate in said cavity with means for holding a previously cast increment in position to close the open side and form one wall of the mold cavity and a matrix forming one wall of said mold cavity having a matrix cavity therein graduated in depth in accordance with the shrinkage of the metal in freezing.

In apparatus for casting printers leads, rules, etc., in successive increments, fused together at their proximate edges, a matrix for forming one edge of said lead or rule,

said matrix having a matrix cavity therein is of gradually diminishing depth toward the exit end of the cavity. v

7. A matrixfor casting printers leads, rules, etc, in successive increments fused to gether at their proximate ledges having a matrix cavity therein the top wall of which is of gradually diminishing depth toward the exit end. and with a flaring discharge extension.

AMOS L. KNIGHT. 

